Safety lathe-dog.



G. J. W ILLETT.

SAFETY LATHE DOG. 4 APPLICATION FILED MAR. 28, 1912.

1,046,525. Patented Dec. 10, 1912.

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SAFETY LATHE DOG.

APPLICATION nun MAR. 23, 1912. 1,046,525.v Patented Dec. 10, 19-12.

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enonen J. WILLETT, or MILWAUKEE, WISCONSIN.

SAFETY LATHE-DOG Specification of Letters Pa e.

rammed Dec. 10, 1912.

Application filed Hatch 2a, 1912. .Serial No. 686,815.

relates to lathes and has novel safety lathe practhe ' ,lathe spindle and to cause its rotation with the lathe head by means of a lathe dog. This dog is usually a clamp having a right- I angled projection engaging with a recess in a similar view showlng my pacity and which ,no clamping'bolts vention, the s the lathe head. The objection to such a dog is, first, its limited holding power, and, second, the liability of serious accident to the operator through the catching of his sleeve on the work-clam ing bolt.

One of the pri cipal objects of my invention i's the provision of a clamping devlce which shall have the maximum holding cashall be arranged that or other parts shall project. I My device presents a smooth circular surface, is-economical to manufacture and has a relatively great capacity or range in the size of the work which may be accommodated without change. Y

My invention will be more readily understood 'by reference to the accompanying drawings,wherein,

Figure 1 is a sectional elevation of a 'device constructed in accordance with my inindle of the lathe being threaded and t e head, forming a part of my device being threaded thereon; Fig. 2 is device attached to a lathe which has an 'irremovable facelate; in this case the head of'my device is olted to the face-plate; Fig. 3 is a section on the line 3'-3 of Fig. 1; Fig. 1 is a sectional elevation of a modified form of the invention; Fig. 5 is a section on the line 5-5 of Fig. 4, and Fig. 6 is a section on the line 6-6 of Fig. 1.

Referring more particularly to the drawings, it will be seen that the device'of my invention is composed of two parts, a head and a clamp. The head, as shown in Figs. 1, 2, 3 and 6, is composed of an end wall 10, having a hubll, threaded on its interior and shank of a spindle 12. Projecting from the adapted to be screwedupon the threaded end wall 10, is a hood or shell 13, which is in the form of a cylinder, the outer surface being smooth and having no projections or openings. Extending inwardly from the shell 13 is a plurality oftwin lugs 14, adapted' for cooperation with lugs on the clamplng member. in the construction shown in Fig. 2, the spindle is not threaded and the face-plate 15 is not adapted for easy removal. Therefore I merely center the head and attach it to the face-plate by means of a plurality of bolts. 16. The head just described is so constructed thatit will accommodate a large number of sizes of clamping members. sary to removethe head except in cases where extremely large or small Work is to be acted upon.

Thus it Will be found unnces- The clamping member,- as best shown ini Figs. 3 and f5, is composed of a circular web 17, there being a hollow sleeve 18 projecting therefrom and defining the Work-receiving opening. A plurality of clamping bolts ;19 are threaded in the sleeve and serve to center and clamp the work. Lugs 20, joined to the web 17 and sleeve18, are adapted for cooperation with the twin projections 1 1 on the head and cause the rotation of the clamping member with the head. It will i be seen that I have allowed a small amountofplay between the coiiperatinglugs for a reason well understood by those skilled in the art. \Vhen the parts are in assembled relation, the clamping bolts as well as the entire clamping member is contained within the limits of the head; furthermore, the web 17 closes the open end of thecylindrical head' and positively prevents the operator from becoming caught bythe clamping In the construction of Figs. 4 and 5,12. I

modification is shown which, howevemjfloes" w not vary greatly from those already scribed. In this construction, the head 21h no overhanging hood, the end wall being};

proyided with for the accommodation of the lugs on the clamping member. The clamping member has an end wall 23, a sleeve 24, accommodata plurality of radial slots ing clamping bolts 25, and an overhan 'ng hood or shell 26. Projecting inwardly om the shell 26 are lugs 27, cooperating the slots 22 in the head. Thus much the same result is secured as in the constfuctions with 1 9 of Figs. 1,2, 3 and 6, the parts being reversed. This construction last described is not as desirable as the clamping bolts are not as easily reached for actuation but the device is equall safe.

Other modi cations than the one described"a're possible and I consider such modifications within the scope of my invention as set forth in the annexed claims.

I claim:

1. In a device of the class described the combination, with a lathe spindle of a head secured thereto, said head b'eingprovided with a c lindrical shell, spaced projections in said s ell, a dog having-lugs coiiperating with said, projections, work clamping means on said dog, said work clamping means,

when the parts are in assembled relation, being entirely confined within the limits of saidhead, substantially as described.

2. In a device of-the'class described, the combination with a lathe spindle of a head secured thereto, said head being in the form of a hollow cylinder and rovided with a plurality of spaced lugs pro ecting inwardly from the cylinder wall, and a dog having portions adapted for coiiperation with said spaced lugs and provided also with work clamping means, substantially as described. 3'. In a device of the class described, the 30 combination with a lathe spindle of'a head having an end wall and a hood, a plurality of .twin lugs projecting inwardly from said hood, a dog having 'a plurality of work clamping'bolts and provided W1th lugs cooperating with the twin lugs on said head, said dog being substantially entirely conitained Within the limits of said hood when the parts are in operative relation, substantially as described.

GEORGE J. WILLETT. Witnesses: v

P. H. ESTES, CHAs. F. MASSEY. 

